PulkoMandy: for me every content like that is 'stolen' or likewise. Because I don't usually look up pictures I see in demos during party and tend to think "oh wow, they've managed to draw such a picture".
And in the case of stolen gfx disappointment comes afterwards, like here.

Maybe some skilled graphists are able to detect conversions within the second they see it, but not me.

If you don't have any graphicians at reach and you are a coder, for me it's ok to take stuff from the internet (but it would be better to ask some graphician). However, it's better than doing nothing at all. The demo is ok, the sequence is nicely chosen. So thumbs up!